81071701355 has 4 divisors (see below), whose sum is σ = 97286041632. Its totient is φ = 64857361080.

The previous prime is 81071701349. The next prime is 81071701357. The reversal of 81071701355 is 55310717018.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81071701355 - 2¹⁰ = 81071700331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81071701357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8107170131 + ... + 8107170140.

It is an arithmetic number, because the mean of its divisors is an integer number (24321510408).

Almost surely, 2^81071701355 is an apocalyptic number.

81071701355 is a deficient number, since it is larger than the sum of its proper divisors (16214340277).

81071701355 is a wasteful number, since it uses less digits than its factorization.

81071701355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16214340276.

The product of its (nonzero) digits is 29400, while the sum is 38.

The spelling of 81071701355 in words is "eighty-one billion, seventy-one million, seven hundred one thousand, three hundred fifty-five".